Nationz Technologies Incorporated

Meixiang Li

Shan Zhu

Yingtong Sun

Yunbo Yu

Xianwei Yang

Li Ouyang

Aimin Shen

Weixi Luo

A method, terminal and secure RF communication system are provided. The method for radio frequency secure communication of the invention comprises: generating magnetic channel data, and transmitting the magnetic channel data via a magnetic channel; establishing a radio frequency link with a peer device which feeds back a response information of the magnetic channel data; generating first radio frequency data, encrypting the first radio frequency data using the magnetic channel data, and transmitting the encrypted first radio frequency data to the peer device via the radio frequency link; and/or receiving encrypted second radio frequency data transmitted by the peer device via the radio frequency link, and decrypting the encrypted second radio frequency data using the magnetic channel data. By the above technical solution, the invention avoids the risk that a preset key is intercepted or decrypted, and enhances the security of the radio frequency link data exchanging process.

Secure RF communication method, terminal and system

A collision detection method for a radio-frequency SIM card with low-frequency magnetic communication comprises: transmitting by a card reader low-frequency card seeking characteristic information; determining by a radio-frequency SIM card A whether an intensity of a low-frequency magnetic induction signal reaches a preset threshold value; if yes, receiving low-frequency card seeking characteristic information and transmitting card seeking response information through a radio-frequency channel; receiving by the card reader the card seeking response information, establishing a radio-frequency connection with the radio-frequency SIM card A, and opening a preset time window; when the preset time window closes, interrupting by the card reader a transaction process with the radio-frequency SIM card A and re-transmitting the low-frequency card seeking characteristic information; if receiving by the card reader card seeking response information transmitted by another radio-frequency SIM card B, ascertaining that a radio-frequency SIM card collision exists.

Collision detection method for a radio-frequency SIM card with low-frequency magnetic communication

A method for improving communication distance accuracy of a transaction system via temperature compensation includes: storing a reference temperature value and a reference field intensity value in a card read micro-controller (), wherein a temperature sensor () is used for detecting an external ambient temperature; based on a difference between the detected external ambient temperature and the reference temperature value, determining at the card read micro-controller () whether to perform temperature compensation to an RF field intensity or an equivalent value of the RF field intensity of a SIM card antenna (), wherein the RF field intensity and the equivalent value of the RF field intensity are received by a card read antenna () and are transmitted to the card read micro-controller through a card read RF module (); transmitting a distance determination result via the card read RF module () to the card read antenna (), which sends the result to an RF SIM card (). This invention includes the following benefits: it can improve distance control accuracy of the transaction system under various external temperatures environment and reduce unconscious long-distance card-swiping mis-operation.

Method and device for improving communication distance accuracy of a transaction system via temperature compensation

A radio frequency (RF) device includes an RF transceiver, an RF antenna, and a magnetic signal detector. The RF is selected to be in the very high frequency (VHF), ultrahigh frequency (UHF), or super high frequency (SHF) bands such that the shielding effect is reduced and the RF device can be configured as a SIM card disposed inside a cellular phone with an increased RF communication range. The magnetic signal detector is used to sense a magnetic field signal from an RF reader, which includes an RF transceiver, an RF antenna, and a magnetic signal transmitter. The longer communication range afforded by the VHF, UHF, or SHF bands is reduced by the sensing of the magnetic field, thereby providing a communication range control, while the RF device and the RF reader exchange information through the RF channel with improved security as a result of the range control.

Growing community of inventors

Guangdong, China

Meixiang Li